Q35 / 164 · NTA Abhyas (NEET) 2020 · Chemistry · Solid State

Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom?

Correct answer
A
127 pm
B
157 pm
C
181 pm
D
108 pm

Solution

For FCC the atoms touch each other along the face – diagonal

r = \frac{\sqrt{2} a}{4} = \frac{\sqrt{2} \times 361}{4}

r

= 127 p m

Hence, the correct answer is option: 'A'.

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